Heat resistance: can adapt to extreme heat. In the extremely cold case, the temperature inside the spark plug reaches 2000 ° C when the mixed gas is burned, and the low temperature gas is cooled during the suction stroke, so that the hot and cold quenching of the 4-stroke engine changes the engine back in 2 times. In the same manner as the heat resistance, it is required to have a heat release property that does not reach the starting point of the surface ignition. Mechanical strength: It can adapt to the intense pressure change, reaching 1 gas pressure below the suction stroke, and reaching 45 pressures above the explosion stroke. The only mechanical strength that can accommodate this intense pressure change.
Insulation: Maintains high-voltage insulation, and when the pressure change is repeated in a sudden temperature change, sufficient insulation can be maintained for a high voltage of about 10 to 30 kV. Airtightness: Maintains airtightness in a hostile environment, and requires a tight airtightness between the mechanical box and the insulator under sudden temperature changes. Wear resistance: Minimize the consumption of the electrode, and minimize the consumption of the electrode in a hostile environment, which is required to have such wear resistance. Anti-fouling property: Minimize the burning dirt, and suppress the dirt of the electrode generated by the combustion of the mixed gas in a hostile environment. The attached activated carbon is also burned out by heat to achieve self-cleaning requirements. Therefore, even at low speeds, the temperature of the spark plug can be quickly increased to reach (about 500 ° C).
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